dispatch_async and calling a completion handler on the original queue

Question

I\'ve seen some related questions but none seem to answer this case. I want to write a method that will do some work in the background. I need this method to call a completi

Answer 1

not sure if this will solve the problem, but how about using NSOperations instead of GCD?:

- (void)someMethod:(void (^)(BOOL result))completionHandler {
NSOperationQueue *current_queue = [NSOperationQueue currentQueue];

// some setup code here
NSOperationQueue *q = [[NSOperationQueue alloc] init];
[q addOperationWithBlock:^{
    BOOL ok = YES;// some result

    // do some long running processing here
    [current_queue addOperationWithBlock:^{
        completionHandler(ok);
    }];
}];